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Nature & Animals

Which outcome impairs respiration if water flows parallel to gill capillaries?

A)Reduced oxygen concentration gradient
B)Increased carbon dioxide accumulation
C)Enhanced ammonia waste clearance
D)Elevated blood flow stagnation risks

💡 Explanation

In parallel flow, oxygen concentration equilibrates, reducing the concentration gradient because efficient oxygen absorption relies on maintaining a gradient via countercurrent exchange. Therefore, less efficient oxygen uptake results, rather than better transfer capabilities or other regulatory changes.

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